Cam-movement.



E. W. NELSON.

CAM MOVEMENI.

APPLICATION FILED SEPT. l, I91].

'1 ,268, 874:. Patented June 11, 1918.

IN l/EN TOR ,5, g, a W

ATTORNEYS UNITED STATES PAEPENT OFFICE.

In: war. more, or raw mm new 203:. CAI-10 ml!- 1,988,874. mam mm mm-Patented June 11, 1918. museum and Iepten ber 1, 1911. semi Io. 188,278.To all km may concern: are secured to the late or frame 0 the latter Bet known that I, Em W. Nnson, a being slotted, 'as gidicated at c, toemitof the Umted States, and residing in new and useful Improvements 1nCam Movements, of which following is a specification, reference bemg hadto the a companying drawing, formin a part hereo In Letters Patent ofthe United States No. 1,152,000, dated September 7, 1915, there '18shown and described a cam-movement which comprises a cam having threefaces formed on a circular arc, a rectangular cam frame and arectilinear guide to which the cam frame is pivotally connected. In thepractical operation of that cam-movement, particularly when driven athigh speed for the purpose of feeding a motion picture film, for whichuse it is designed, it is found that through lack of balance there isconsiderable vibration and that there is apt be binding of therectilinear guide which (is to slow down the movement. It is the objectof. this invention to improve the cammovements of the general type ofthat shown in said Letters Patent with the view to overcoming thedifliculties referred to, as well as for the urpose of simplifying thecon- 0 this end the triangular cam 0r cams is or are formed upon acounterbalanced wheel or drum the cam frame is a to engage the himdirectly, without e intervention of a separate finger, and the extensionof the cam frame is 'ded bfina freely swinging link in place of e rectiear guide of the patent.

e invention will be more fully explained hereinafter with reference tothe aocom drawing in which it is illustrated an in whichh 1631s a viewin front elevation of t e in v movement. Figf is a view of the same inside elevation, cam-shaft in section.

.flisatopviewthereof Alt ough the cam-movement 1s particuintended forthe feeding of a mot-ion cturelfilm shoznlmin the drawing, room ate inias a eviee, i is P theto illllzlfate zfi gcribe in a m on pi ture camerathan as indihed to: mt

rotary any able Iourca, is mounted in earing: 6 which the travel of thelugs or points which directly engage at one side or at both sides, theperforated film. 0n the shaft, between the two bearings b, b, is secureda suitable counterwelglhte balance wheel d, and to each end is ereof issecured a triangular cam c, with each face formed on a circular are, oneof such faces being concentric with the shaft a. Cooperating with eachcam is a rectangular cam frame which is suitably fitted to contactinterior y with the cam e In its rotation, as shown in Fig. 2. Each camframe is provided with a roLection or point f which projects throng t eslot 0 of the plate 0 so as to enga e the corresponding side of theperforate film. The cam frame f is also formed with an extension 1"which is pivotally supported upon and guided by a link g substantiallyat right angles to the direction of the film, the llllk bemlg itselfpivotally mounted on a bracket h w ich is secured to the frame or platec.

s shown, the the pivot-screw It a long cross-bar 9 link 9 has a longbearing on and at its other end has to each end of which is pivotallysecured, as by a screw 9, the correspondin extension f of the cam frame.A single ling 9 thus serves as a common guide and support for the twocam frames when two cam frames are used. It will be understood, however,that in some cases a sin le cam frame may be used.

he mode of operation of the improved device will be readily understoodwithout or explanation and it will be seen that the cam frame or bothcam frames are so supported and ided by the swinging link or links as towave free movement at all times without danger of binding. Theconstruction, moreover, is exceedingly simple and direct in its actionand well adapted to operate at high speed without vibration.

in as my invention: 1. A cam-movement comprising a trianfitlar cam witheach face formed on a circuarc, a cam frame cooperating with the camand. provided with an extension, and a link p'voted on a fixed point andpivotally connected to said extension and constrtn the sole support andgugideAfor the can t m clmdnbvemen comprising anfilnl'olmwithelchfaceformedonaoircua rectangular cam frame cobpcratingwith the cam and provided with an extension and with an actuating tooth,and a pivoted link pivotally connected to said extension and supportmgand guiding the cam frame.

3. A cam-movement comprising a counterbalanced driving disk, atriangular cam secured to each face of the driving disk and having eachof its own faces formed on a wasp circular arc, rectanglilar cam framescooperating with the cams and rovided each with an extension, and asingle ivoted link pivotally connected to b0 0 said ns and supportinganddriving both of said cam frames.

This specification signed this 29th day of August, A. D. 1917.

ERIK WM. NELSON.

